Granite Tri-Square Long Form Calibration Certificate No Material Granite Application Grade Laboratory Color Pink Flatness 0.000025 in per 6 in Grade AA Height - Inch 9 in Height (mm) 225 Included Certification Short Form Certificate of Accuracy with NIST Traceability Length (In.) 6 in Length (mm) 150 Number of Finished Faces 3 Number of Pieces Single Block Parallelism 0.000025 in per 6 in Maximum of 0.000037 in Size (In.) 6 in x 9 in x 3 in Size (mm) 150 mm x 225 mm x 75 mm